<div id="disable-next-demo">
  <div>
    <button mat-raised-button color="accent" (click)="startTour()">
      Start tour
    </button>
  </div>
  <button mat-raised-button id="enable-next" (click)="enableNext()">
    Enable next
  </button>
  <h3 id="last-step">Finish tour</h3>
</div>
